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Date: Tue, 18 Oct 2016 11:48:36 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: use BIO_MAX_PAGES for bio allocation
We don't need to allocate bio partially in order to maximize sequential writes.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/checkpoint.c | 2 +-
fs/f2fs/data.c | 4 +---
fs/f2fs/node.c | 3 +--
fs/f2fs/segment.c | 4 ++--
fs/f2fs/segment.h | 17 +++--------------
5 files changed, 8 insertions(+), 22 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 654f5d7..157b7fd 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -228,7 +228,7 @@ void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
f2fs_put_page(page, 0);
if (readahead)
- ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
+ ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
}
static int f2fs_write_meta_page(struct page *page,
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 77cd9ac..fe8ce5a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -307,10 +307,8 @@ void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
__submit_merged_bio(io);
alloc_new:
if (io->bio == NULL) {
- int bio_blocks = MAX_BIO_BLOCKS(sbi);
-
io->bio = __bio_alloc(sbi, fio->new_blkaddr,
- bio_blocks, is_read);
+ BIO_MAX_PAGES, is_read);
io->fio = *fio;
}
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 69c42e2..285e2a5 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2101,7 +2101,6 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
struct f2fs_node *rn;
struct f2fs_summary *sum_entry;
block_t addr;
- int bio_blocks = MAX_BIO_BLOCKS(sbi);
int i, idx, last_offset, nrpages;
/* scan the node segment */
@@ -2110,7 +2109,7 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
sum_entry = &sum->entries[0];
for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
- nrpages = min(last_offset - i, bio_blocks);
+ nrpages = min(last_offset - i, BIO_MAX_PAGES);
/* readahead node pages */
ra_meta_pages(sbi, addr, nrpages, META_POR, true);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 7a7e3f1..a21a1a3 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2355,10 +2355,10 @@ static void build_sit_entries(struct f2fs_sb_info *sbi)
int sit_blk_cnt = SIT_BLK_CNT(sbi);
unsigned int i, start, end;
unsigned int readed, start_blk = 0;
- int nrpages = MAX_BIO_BLOCKS(sbi) * 8;
do {
- readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT, true);
+ readed = ra_meta_pages(sbi, start_blk, BIO_MAX_PAGES,
+ META_SIT, true);
start = start_blk * sit_i->sents_per_block;
end = (start_blk + readed) * sit_i->sents_per_block;
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index a6efb5c..d8ff069 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -102,8 +102,6 @@
(((sector_t)blk_addr) << F2FS_LOG_SECTORS_PER_BLOCK)
#define SECTOR_TO_BLOCK(sectors) \
(sectors >> F2FS_LOG_SECTORS_PER_BLOCK)
-#define MAX_BIO_BLOCKS(sbi) \
- ((int)min((int)max_hw_blocks(sbi), BIO_MAX_PAGES))
/*
* indicate a block allocation direction: RIGHT and LEFT.
@@ -698,13 +696,6 @@ static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
return false;
}
-static inline unsigned int max_hw_blocks(struct f2fs_sb_info *sbi)
-{
- struct block_device *bdev = sbi->sb->s_bdev;
- struct request_queue *q = bdev_get_queue(bdev);
- return SECTOR_TO_BLOCK(queue_max_sectors(q));
-}
-
/*
* It is very important to gather dirty pages and write at once, so that we can
* submit a big bio without interfering other data writes.
@@ -722,7 +713,7 @@ static inline int nr_pages_to_skip(struct f2fs_sb_info *sbi, int type)
else if (type == NODE)
return 8 * sbi->blocks_per_seg;
else if (type == META)
- return 8 * MAX_BIO_BLOCKS(sbi);
+ return 8 * BIO_MAX_PAGES;
else
return 0;
}
@@ -739,11 +730,9 @@ static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
return 0;
nr_to_write = wbc->nr_to_write;
-
+ desired = BIO_MAX_PAGES;
if (type == NODE)
- desired = 2 * max_hw_blocks(sbi);
- else
- desired = MAX_BIO_BLOCKS(sbi);
+ desired <<= 1;
wbc->nr_to_write = desired;
return desired - nr_to_write;
--
2.8.3
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